Regarding the number part: what if there were athletes that did not come out yet? (I don't know how it works, totally ignorant on the matter)
Then for the rest I see what you mean. I guess my opinion as a science guy is to do more tests (like, let them openly compete, more data more sense)
The reality is that nothing is really dying and nothing is really changing. Twitter is still fully operational and other than a small hit nothing happened. Twitch already did a step back. For Reddit we'll see but only a really small percentage of reddit is using third party apps.